Frost Dates: First and last frost dates for Castle Rock, CO

In the Spring
Temperature 10% 20% 30% 40% 50% 60% 70% 80% 90%
Last 16° Apr 17 Apr 12 Apr 9 Apr 6 Apr 4 Apr 1 Mar 29 Mar 26 Mar 21
Last 20° Apr 28 Apr 23 Apr 20 Apr 17 Apr 14 Apr 11 Apr 8 Apr 5 Mar 31
Last 24° May 9 May 4 Apr 30 Apr 27 Apr 24 Apr 22 Apr 18 Apr 15 Apr 10
Last 28° May 19 May 15 May 11 May 8 May 6 May 3 Apr 30 Apr 27 Apr 22
Last 32° Jun 11 Jun 4 May 30 May 26 May 22 May 19 May 15 May 10 May 3
Last 36° Jun 16 Jun 10 Jun 6 Jun 2 May 30 May 27 May 23 May 19 May 13

In the Fall
Temperature 10% 20% 30% 40% 50% 60% 70% 80% 90%
First 16° Oct 11 Oct 17 Oct 22 Oct 25 Oct 29 Nov 1 Nov 5 Nov 9 Nov 16
First 20° Oct 1 Oct 8 Oct 12 Oct 16 Oct 20 Oct 24 Oct 28 Nov 2 Nov 8
First 24° Sep 21 Sep 27 Oct 2 Oct 5 Oct 9 Oct 12 Oct 16 Oct 20 Oct 26
First 28° Sep 19 Sep 23 Sep 26 Sep 29 Oct 2 Oct 4 Oct 7 Oct 10 Oct 14
First 32° Sep 12 Sep 16 Sep 19 Sep 22 Sep 24 Sep 27 Sep 30 Oct 3 Oct 7
First 36° Sep 5 Sep 9 Sep 12 Sep 15 Sep 18 Sep 20 Sep 23 Sep 26 Sep 30

Now that you know your frost dates, use our Garden Planting Calendar for Castle Rock, CO to know when to sow and transplant your various vegetable plants!

Data is provided by the NOAA National Centers for Environmental Information. Photography by Garden.org member TBGDN.

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